Problem configuring auto assign role

Hi,
I installed auto assign role version autoassignrole-6.x-1.0-beta3.tar.gz and enabled the module. I set permissions for autoassignrole. On clicking User Management -> auto assign role, I get blank page. I tried with all versions of 6.x and I face same problem. All my other modules and links are working fine. Can you suggest any other module? I wish to select b/w various roles when user fills registration form.Please do reply.